Climate and monthly weather forecast
Saint Charles, IA

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Weather in January

January, the same as December, in Saint Charles, Iowa, is another subzero cold winter month, with temperature in the range of an average high of 28.8°F (-1.8°C) and an average low of 15.3°F (-9.3°C). The coldest month is January, with an average high-temperature of 28.8°F (-1.8°C) and an average low-temperature of 15.3°F (-9.3°C). Weather in January »

Weather in February

The last month of the winter, February, is an icy month in Saint Charles, Iowa, with an average temperature ranging between max 32.5°F (0.3°C) and min 18.3°F (-7.6°C). Saint Charles, Iowa, signifies an average high-temperature of a wintry 32.5°F (0.3°C) in February, closely mirroring the 28.8°F (-1.8°C) of January. Weather in February »

Weather in March

March, the first month of the spring in Saint Charles, is a frosty month, with temperature in the range of an average low of 32.5°F (0.3°C) and an average high of 47.8°F (8.8°C). A clear rise in the average high-temperature is observed during March, increasing from a wintry 32.5°F (0.3°C) in February to a chilly 47.8°F (8.8°C). Weather in March »

Weather in April

April in Saint Charles, Iowa, is a refreshing spring month, with an average temperature varying between 59.7°F (15.4°C) and 42.3°F (5.7°C). With the onset of April, Saint Charles sees a temperature rise, with the average high-temperature moving from March's frosty 47.8°F (8.8°C) to a refreshing 59.7°F (15.4°C). Weather in April »

Weather in May

May, the last month of the spring in Saint Charles, is an agreeable month, with temperature in the range of an average low of 52.7°F (11.5°C) and an average high of 69.4°F (20.8°C). The onset of May marks an increase in the average high-temperature, moving from a moderate 59.7°F (15.4°C) in April to a pleasant 69.4°F (20.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Saint Charles, Iowa, with an average temperature fluctuating between 63°F (17.2°C) and 79.7°F (26.5°C). In Saint Charles, the onset of June comes with an increased average high-temperature, moving from May's pleasant 69.4°F (20.8°C) to a moderately hot 79.7°F (26.5°C). Weather in June »

Weather in July

July, like June, in Saint Charles, Iowa, is another warm summer month, with temperature in the range of an average high of 83.3°F (28.5°C) and an average low of 65.1°F (18.4°C). With average high temperatures of 83.3°F (28.5°C) and lows of 65.1°F (18.4°C), July is the warmest month. Throughout July, the heat index is appraised at a tropical 93.2°F (34°C). Weather in July »

Weather in August

August, the last month of the summer in Saint Charles, is also a moderately hot month, with an average temperature ranging between min 62.6°F (17°C) and max 81.5°F (27.5°C). Saint Charles's average high-temperature marks a still warm 81.5°F (27.5°C) with the advent of August, closely mirroring that of the preceding month. Weather in August »

Weather in September

September, the first month of the autumn in Saint Charles, is also a moderately hot month, with temperature in the range of an average high of 75.4°F (24.1°C) and an average low of 55.9°F (13.3°C). During the shift to September, a minor reduction in average high-temperature is observed, shifting from 81.5°F (27.5°C) in August to a still warm 75.4°F (24.1°C). Weather in September »

Weather in October

October, like September, in Saint Charles, Iowa, is another comfortable autumn month, with an average temperature ranging between min 44.2°F (6.8°C) and max 60.8°F (16°C). As Saint Charles welcomes October, there is a noticeable shift in the average high-temperature, dropping from September's warm 75.4°F (24.1°C) to a refreshing 60.8°F (16°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Saint Charles, Iowa, with an average temperature ranging between min 32.7°F (0.4°C) and max 47.3°F (8.5°C). In Saint Charles, the beginning of November is marked by a lowered average high-temperature, shifting from October's refreshing 60.8°F (16°C) to a frosty 47.3°F (8.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also an icy month in Saint Charles, Iowa, with an average temperature varying between 22.5°F (-5.3°C) and 34.3°F (1.3°C). As Saint Charles enters December, the average high-temperature decreases from the a chilly 47.3°F (8.5°C) of November to a wintry 34.3°F (1.3°C). Weather in December »
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month in Saint Charles?

With average high temperatures of 28.8°F (-1.8°C) and lows of 15.3°F (-9.3°C), January is the coldest month in Saint Charles, Iowa.

What are the most humid months in Saint Charles?

The months with the highest humidity are January, February and June, with an average relative humidity of 82%.

What is the driest month in Saint Charles?

The month with the least rainfall is January, when the rain falls for 3.8 days and typically collects 0.91" (23mm) of precipitation.

How much does it rain in Saint Charles?

In Saint Charles, during the entire year, the rain falls for 133 days and collects up to 26.14" (664mm) of precipitation.

When does it snow in Saint Charles?

Months with snowfall in Saint Charles are January through May, October through December.

How much does it snow in Saint Charles?

In Saint Charles, Iowa, during the entire year, snow falls for 35 days and aggregates up to 15.04" (382mm) of snow.

What is the month with the least sunshine in Saint Charles?

With an average of 4.4h of sunshine, January has the least sunshine of the year in Saint Charles.

What are the months with the lowest UV index in Saint Charles?

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Saint Charles.

What is the snowiest month in Saint Charles?

The month with the most snowfall in Saint Charles, Iowa, is February, when snow falls for 8.3 days and typically aggregates up to 4.53" (115mm) of snow.

When is Daylight Saving Time (DST) in Saint Charles?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

What is the rainiest month in Saint Charles?

May is the month with the most rainfall in Saint Charles. Rain falls for 17.5 days and accumulates 3.98" (101mm) of precipitation.

When it does not snow in Saint Charles?

June through September are months without snowfall.

When are the longest days in Saint Charles?

The month with the longest days in Saint Charles is June, with an average of 15h and 6min of daylight.

What are the months with the highest UV index in Saint Charles?

June through August, with an average maximum UV index of 6, are months with the highest UV index.

What are the warmest months in Saint Charles?

The warmest period in Saint Charles is July, when temperatures fluctuate between an average high of 83.3°F (28.5°C) and a low of 65.1°F (18.4°C).

What month has the most sunshine in Saint Charles?

With an average of 10.3h of sunshine, July has the most sunshine of the year in Saint Charles, Iowa.

What is the least humid month in Saint Charles?

The least humid month is October, with an average relative humidity of 71%.

What is the month with the shortest days in Saint Charles?

The month with the shortest days in Saint Charles is December, with an average of 9h and 18min of daylight.

Average temperature
Saint Charles, IA

Average temperature - Saint Charles, IA

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (28.8°F).

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).

Average pressure
Saint Charles, IA

Average pressure - Saint Charles, IA

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed
Saint Charles, IA

Average wind speed - Saint Charles, IA

The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (7mph).

Average humidity
Saint Charles, IA

Average humidity - Saint Charles, IA

The months with the highest relative humidity are January, February and June (82%).
The month with the lowest relative humidity is October (71%).

Average rainfall
Saint Charles, IA

Average rainfall - Saint Charles, IA

The wettest month (with the highest rainfall) is May (3.98").
The driest month (with the least rainfall) is January (0.91").

Average rainfall days
Saint Charles, IA

Average rainfall days - Saint Charles, IA

The month with the highest number of rainy days is June (17.9 days).
The months with the least rainy days are January and February (3.8 days).

Average snowfall
Saint Charles, IA

Average snowfall - Saint Charles, IA

The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Saint Charles, IA

Average snowfall days - Saint Charles, IA

The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Saint Charles, IA

Average daylight / Average sunshine - Saint Charles, IA

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days
Saint Charles, IA

Average sunshine days - Saint Charles, IA

The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is June (9.8 days).

Average UV index
Saint Charles, IA

Average UV index - Saint Charles, IA

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

Average visibility
Saint Charles, IA

Average visibility - Saint Charles, IA

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

Saint Charles, Iowa, USA

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